Telephonic annunciator



Q (No Model.)

G, L. WEAVER.

TELEPHONIO ANNUNGIATOR. No. 276,739. Patented May 1,1883.

NITED STATES PATENT ()FFICE.

GEORGE L. WEAVER, OF BOSTON, MASSACHUSETTS.

TELEPHONIC ANNUNCIATOR.

SPECIEICATION forr'ning part of Letters Patent N 0. 276,739, dated May 1, 1883. Application filed December 11, 1882. (No model.)

to which said invention appertains to make.

and use the same, reference being bad to the accompanying drawings, forming a part of this specification, in whicht Figure 1 is a side elevation, showing the drop 7 set or up; and Fig. 2, an end view, showing the drop sprung or down.

Like letters of reference indicate corresponding parts in the different figures ot' the drawlngs.

My invention relates more especially to the drop or signal of the switch-board; and it consists in a novel construction and arrangement of the parts, as hereinafter more fully setforth and claimed, by which a more effective device of this character is produced than is now in common use. 1n telephone switch -boards as ordinarily constructed the armatures of the magnets consist of a long flat metallic lever pivoted near one end, the short arm, which engages with the signal, being weighted to overbalance the long arm and keep it out of contact with the magnets. The construction and arrangement of the parts render a strong current necessary to lift the weighted end of the armature, and also make it inconvenient to adjust the signal or drop in as delicate a mannor as desirable. To overcome this objection is the design of my improvement, the nature and operation of which will be readily understood by all conversant with such matters from the following explanation, its extreme simplicity rendering an elaborate description unnecessary.

In the drawings, A A are the magnets or coils, which are insulated in the usual manner and secured to the under side of the bar B.

Projecting downwardly from the bar B there is a bar, 0, arranged at right angles thereto, and provided at its lower end with the arms d a, as shown in Fig. 1.

An armature, D, arranged horizontally beneath the coils A, is pivoted near its outer end, at w, in the arm at, thus dividing it into two levers, having acommon fulcrum, the short lever I being thickened or so constructed as to nearly balance the long lever m, the long lever being slightly heavier than the short one.

A signalror drop, E, arranged in a nearly vertical position, is pivoted at t, near its lower end, in the arm a, being provided with an adjusting-screw,f, in the bar (3, to keep it ata proper distance from said bar.

The armature D is also provided at its outer end with a screw, 1, in the arm a, for adjusting it relatively to the maguetsAand drop or signal E.

In the use of my improvement the armature is first so adjusted that when the short lever lis against the screw r and the drop E ele vated the outer end of the lever B will be slightly higher than the lower end of the drop, or so that when the drop is raised its pivoted end will engage the outer end of the armature and become set, as shown in Fig. 1, the number of the drop being concealed. The parts being in the position described, and as shown in Fig. 1, if, now, a current of electricity is passed through the wires 2, causing the magnets A A to act on the armature, its long arm or lever m will be raised, depressing its short arm or lever l, thereby disengaging the armature and signal E and permitting the signal to fall and disclose its number, in a manner which will be readily understood without a more explicit description.

Having thus explained my invention, what I claim is- In a telephonic annunciator, a pivoted armature arranged horizontally beneath a magnet, in combination with a vertically-arranged pivoted signal, the short arm of the armature being adapted to engage directly with the short arm of the signal, and the signal arranged with its center of gravity outside of its center of motion, or so as to drop when released by G EQ. L. VVEAVE R.

Witnesses:

G. A. SHAW, H. E. METoALF. 

